except I think you have it set wrong ?? you moved tracking sensitivity to fast I think it should be set on the slowest point. Once focus locks you want it to stay there on not jump off. so you want sensitively to be slower and stay in place.
Read here. This has been the standard on the new AF systems since the 7D introduction. I dont think the R has changed.......https://www.dpreview.com/forums/post/41258784
For birding this was one of the MAJOR required settings for the 1D and 1D MkII.
It used to be only on 1D bodies in a separate set of settings that could not be done in camera, called "Personal Functions" IIRC.. anyway, this was a magic bullet for AF on my 1D2.